LONDON, ONT. -- Police in London, Ont. have laid a second-degree murder charge in relation to a weekend homicide of a former alleged war criminal and National Patriotic Front Liberia member.

Late Thursday, police announced Keiron Gregory, 22, of North York Ont. was charged by way of warrant.

Police aren't sure of his current whereabouts but it is believed he may be in the Greater Toronto Area.

Bill Horace, 44, of Toronto was shot to death during the incident on Pochard Lane around 4:40 a.m. Sunday.

According to police, four suspects arrived at 232 Pochard Ln. in two vehicles.

They entered the house and a physical altercation took place, with Horace being shot by one of the suspects.

London homicide victim Bill Horace

He was rushed to hospital where he was pronounced dead.

The suspects fled the scene before police could arrive.

Horace had ties to the National Patriotic Front in Liberia, a rebel group involved in the First Liberian Civil War from 1989 to 1996.

He was named as a former commander in a rebel Liberian army whose alleged war crimes were under investigation.

Although, it's unclear if his past had anything to do with his murder.

But London police say the victim and the suspect knew each other.

“We're still investigating the extent of that relationship but they had had some interactions in the weeks and days leading up to June 21st,” says Det.-Superintendent Chris Newton.

So far, no guns have been recovered.

“Gregory and the other three suspects due to the nature of the crime still must be considered armed and dangerous and I would encourage any citizen who knows their whereabouts to contact police via 911 and not approach them,” adds Newton.

All four suspects are still on the run and the investigation continues.