Guelph police police responded to an assistance call at a residence on Hasler Crescent  on July 18th at approximately 12:09am.

Police located the 54 year old woman, she was pronounced dead at the scene. The circumstances surrounding her death were deemed suspicious.

Investigators arrested a 26 year old male for first degree murder at 6:17am July 18th on a City of Guelph bus. Police are not seeking any other suspects.

Update July 19th
Guelph police have identified the victim as Mirella Roncato 54, and the accused as her 26 year old son Jacob Roncato.

Anyone with information in relation to this investigation can contact Det. Sgt. Dave Begin at 519-824-1212