VILLAGE OF ARMADA, Mich. -

As family members gathered Thursday at a funeral home for April Millsap's visitation, police continued working the case of her killing.

Law enforcement issued a new plea for tips.

"Most of our cases are solved by somebody seeing something and just saying, 'Hey, I saw this,' and it kind of snowballs as you start to look into the rest of the investigation," said Michigan State Police Lt. Michael Shaw.

Millsap's death was ruled a homicide and the Local 4 Defenders have learned police have new, very specific information regarding how the 14-year-old Armada girl was killed. However, the insider information is being kept quiet while police say it likely will be the key when they question the person they believe is responsible for the murder.

A gray van is no longer part of this case, but the search continues for a blue motorcycle or moped.

"So far, we've had about 550 to 600 tips in the area," said Shaw. "We go through every one of them."

Police and FBI were stopping vehicles Thursday evening in Armada in search of more tips.