SOUTHFIELD, Mich. -

New information can help solve the murder of a young man and the shooting of three others.

They were all at a birthday party at Marvin’s Garden Hotel in Southfield when three or four robbers attacked them at gunpoint at 1 a.m. on May 27.

Ellis Ross III, 24, was killed.

“He had a hotel room somewhere else and just stopped by to say happy birthday to his cousin," said Ross' mother, Lisa.

Southfield police have been working the case but no arrests have been made.

Family members say Ross was targeted for the attack because he was wearing expensive Cartier Sunglasses.  He had added diamonds on the side.

“They were vicious. They shot my son eight times over a pair of glasses, which he worked every day for,” says Ellis Ross II, his dad.

“I’m pleading with the public. This was an execution-type killing,” says Ellis Ross I, the grandfather.

A witness at the hotel, who says she got a look at a gunman who was younger, 18 to 20, thin build with a heavy southern accent. 

A composite put out by Southfield Police shows an older man. 

Marvin Gardens shooting sketch

Three or four were involved in the robbery and shooting.

Garnes says the robbers left the hotel in a tan colored Suburban with tinted windows and LED lights on the back.

Dozens of family members and supporters were with the four families at the Crime Stoppers headquarters Tuesday to announce a reward of $3,500 if anyone calls to solve the crime by midnight tonight. 

The number is 1-800-SPEAK-UP.