Police have laid charges in connection with Calgary's first murder of 2008.

On January 1, 33-year old Mohamed Aman was stabbed to death. His body was found on the lawn of a home on 19th Street and 49th Avenue SW.

Last Friday, police charged 33-year old Sebastian Prokop with second-degree murder. Prokop has been in jail in Ontario since March on an unrelated criminal matter. Police say the victim and the suspect were acquaintances.

It took nine months to lay charges. Calgary Police Staff Sgt. Kevin Forsen says it was the determination of the lead detective that led to an arrest.

"The detective wouldn't give up. He just kept knocking on doors, and over time, people started providing information and we went from there. But if it wasn't for the hard work of the primary investigator, we wouldn't be here today."

Prokop is well known to police. He is from Calgary, and CTV News has learned he was involved in one of the darkest days in the history of the Calgary Police Force.

Through our searches, we have discovered that Prokop was in the passenger seat of the vehicle that ran down and killed Constable Rick Sonnenberg in October of 1993.

Prokop was 18-years old at the time. He was in a stolen vehicle that was trying to evade police. It struck and killed Sonnenberg as he was attempting to lay out a spike belt on Deerfoot Trail.

That was 15 years ago this month. Prokop has been in and out of jail ever since. When he was arrested for Aman's murder, he was in custody in Milton, Ontario, for what police say is a non-violent criminal matter.

On Wednesday night, Prokop arrived in the city to face the charges.