All four people charged in the hyperbaric chamber explosion death of a 5-year-old boy in Oakland County were back in court, and a key piece of evidence was revealed.

The four people charged in the death of a 5-year-old boy who was killed in a hyperbaric chamber explosion at a health care facility in Oakland County were back in court this week. Here's what we learned from experts and police who testified.

The lead officer testified about responding to the "chaotic" scene and finding a crucial safety item for operating hyperbaric chambers, unused and in a "junk drawer" at the Oxford Center, after a 5-year-old boy died.

Morning 4 is a quick roundup of stories we think you should know about to start your day.

The four people charged in the death of a 5-year-old boy who was killed in a hyperbaric chamber explosion at a health care facility in Oakland County will return to court Monday.

The founder and CEO of an Oakland County health care facility, who is charged with the death of a 5-year-old boy who was killed in a hyperbaric chamber explosion, is expected to appear in court on Tuesday.

The four people charged in the death of a 5-year-old boy who was killed inside a hyperbaric chamber in Oakland County spent two full days in court this week.

The four workers charged in the death of a 5-year-old boy who was killed in a hyperbaric chamber explosion at a health care facility in Oakland County appeared in court on Monday and Tuesday.

A hyperbaric safety expert testified Tuesday that the death of a 5-year-old boy in a hyperbaric chamber fire could have been prevented if he had been wearing a standard safety device — a grounding strap.

The four workers charged in the death of a 5-year-old boy who was killed in a hyperbaric chamber explosion at a health care facility in Oakland County are scheduled to appear in court on Monday.

The founder and CEO of the facility where a 5-year-old boy was killed in a hyperbaric chamber explosion appeared in court on Monday for a motion hearing about the use of a taint team in this case.

The four workers charged in the death of a 5-year-old boy who was killed in a hyperbaric chamber explosion at an Oakland County facility are scheduled to appear in court on Wednesday.

The four workers charged in the Oakland County hyperbaric chamber explosion death were back in court on Wednesday, and another probable cause conference was scheduled due to a delay with an inspection at the Oxford Center.

Morning 4 is a quick roundup of stories we think you should know about to start your day.

The four workers charged in the death of a 5-year-old boy who was killed in a hyperbaric chamber explosion at an Oakland County facility are scheduled to appear in court on Wednesday.

The CEO and founder of the Oakland County health care facility where a 5-year-old boy died in a hyperbaric chamber explosion posted bond on Wednesday.

Three of the four people charged in connection with the hyperbaric chamber explosion that killed a 5-year-old boy in Oakland County have been released on bond, but the owner of the facility remains behind bars.

The CEO and founder of the Oakland County health care facility where a 5-year-old boy was killed in a hyperbaric chamber explosion is the only one of the four workers charged to remain in jail.

In response to the tragic death of 5-year-old Thomas Cooper in a hyperbaric chamber explosion at the Oxford Center in Troy, Michigan lawmakers are proposing legislation for mandatory oversight of such facilities.

One of the four workers charged in the death of a 5-year-old boy who was killed in a hyperbaric chamber explosion was back in court on Wednesday.

The CEO and three other workers who were charged in connection to the death of a 5-year-old boy who was killed in a hyperbaric chamber explosion in Oakland County were back in court on Wednesday.

Here's a timeline that details everything we've learned after a 5-year-old boy was killed in a hyperbaric chamber explosion in Oakland County.

Court documents have revealed some of the text messages that the Oxford Center CEO sent about hyperbaric chambers and the 5-year-old boy who died in one of the facility's machines

Pillows that posed a fire risk were among the issues with safety protocols that experts discovered at the facility where a 5-year-old boy was killed in a hyperbaric chamber.

We’ve learned much more about the specific allegations against the CEO and three other employees of an Oakland County health care facility where a 5-year-old boy was killed in a hyperbaric chamber explosion.

According to court documents, Peterson sent still photos of Cooper, from the CCTV footage, burning inside of the chamber. Along with the images, she allegedly texted, “If my leg was on fire, I would at least try to hit it and put it out. He just laid there and did nothing.”

An Oakland County health clinic where a 5-year-old boy was killed when a hyperbaric chamber exploded reportedly has a history of fraud investigations, evidence tampering and witness intimidation.

Prosecutors said a safety manager at the Oxford Center conducted “his own experiments” on a hyperbaric chamber to prove to employees it was safe prior to a deadly explosion that killed a 5-year-old boy.

The primary management assistant for the Oakland County center where a 5-year-old boy was killed in a hyperbaric chamber explosion is accused of altering the machines and making them seem safer than they were.

Four workers have been arraigned in connection to the death of a 5-year-old boy who was killed in a hyperbaric explosion in Oakland County.

Four Oxford Center employees, including the CEO and safety manager, have been charged in connection to the death of a 5-year-old boy who was killed in a hyperbaric chamber explosion in Oakland County.

Four Oxford Center employees, including the CEO and safety manager, have been charged in connection to the death of a 5-year-old boy who was killed in a hyperbaric chamber explosion in Oakland County.

The attorney representing the family of the 5-year-old boy killed in a hyperbaric chamber explosion spoke to Local 4 on Tuesday.

Police in Troy confirmed that four people have been taken into custody in connection with a hyperbaric chamber explosion that killed a 5-year-old boy.

The family of a 5-year-old boy who was killed inside a hyperbaric chamber that exploded in Oakland County is demanding answers.

The family of 5-year-old Thomas Cooper, who was killed inside a hyperbaric chamber that exploded at an Oakland County healthcare facility, is seeking answers to find out what went wrong.

The family of a 5-year-old boy killed in a hyperbaric chamber explosion at an Oakland County healthcare facility has retained an attorney.

A child was killed at a healthcare facility in Troy while getting treatment inside a hyperbaric chamber.

A 5-year-old boy from Royal Oak was killed in an explosion while receiving hyperbaric oxygen therapy at a healthcare facility in Oakland County, according to the fire department.