Waterloo Regional Police say they are "still actively searching" for a man they believe is responsible for stabbing a Kitchener woman to death on April 28.

Melinda Vasilije, 22, was found dead in her Country Hill Drive apartment after police were called there around 3 a.m. on April 28.

Police said a post mortem revealed she died from multiple stab wounds.

Ager Mohsin Hasan, 24, faces second-degree murder charges in the case.

"We are still actively searching for Ager Mohsin Hasan in connection with the homicide of Melinda Vasilije. We believe he is still in the United States of America and are liaising with United States authorities to determine his whereabouts," police media relations co-ordinator Cherri Grenno told CBC News in an email Tuesday.

Anyone with information is urged to contact Waterloo Regional Police or Crime Stoppers.

Melinda Vasilije stabbed to death Kitchener

The body of 22-year-old Melinda Vasilije was found inside a Kitchener apartment building April 28. Police say she died from multiple stab wounds. (Instagram)

Honda HR-V may have different plates

Police know Hasan crossed into the U.S. on the Peace Bridge from Fort Erie, Ont., to Buffalo, N.Y., around 6 a.m. on April 28 driving a black Honda HR-V.

A man matching his description was spotted switching licence plates off a vehicle in a Walmart parking lot in Harborcreek Township, near Erie, Pa., around 10 a.m. that same day.

It's believed the man put the stolen plate on his own vehicle and fled the area.

State police said the licence plate is Pennsylvania registration EZV1654 and had a Fraternal Order of Police medallion emblem attached to it.

The Honda HR-V may have also been displaying Ontario licence plate BPKT509. 

Suspect facing other charges

Police have said previously that Hasan made contact with family on April 29.

Insp. Michael Haffner said Hasan and Vasilije had been in a relationship for about a year.

Hasan is also facing one charge of break and enter and two counts of assault stemming from an altercation at Vasilije's apartment on April 3. Haffner noted Vasilije was not assaulted during that incident.

Police noted Hasan was released but was not supposed to enter Waterloo region or have contact with Vasilije as part of his release conditions.