The son of a Mississauga woman found dead last April has now been charged with first-degree murder in connection with her death.

Ming-Chien "Theresa" Hsin’s body was found in a black BMW in a parking lot in Mississauga on April 10.

Police found the 59-year-old’s body after they were called to an address on Robert Speck Parkway, near the Square One Shopping Centre. They said she had suffered “obvious signs of trauma,” but initially did not provide a cause of death.

Officers announced Thursday that Hsin died of stab wounds.

Peel police announced Wednesday that Eric Lu, 25, has been charged with first-degree murder, noting Lu is the victim’s son. Police said Lu initially reported his mother as missing, two days before her body was found.

Lu is the third person arrested in connection with Hsin’s death.

On Monday, Peel police arrested and charged 21-year-old Mark Dookhram. A second suspect, 25-year-old Justine Ordonio, was arrested on Tuesday. Both suspects have also been charged with first-degree murder.

Court records show Hsin and some of her business partners had recently been sued for more than $5 million in a land deal gone bad. Hsin had also recently franchised her spa business, and not all franchisees were happy with the deal.

According to police, Hsin had previously been stabbed in the underground parking lot of her home last year and survived life-threatening injuries. Police are investigating whether the suspects in Hsin’s death were involved in that attempt, six months before her murder.

“We know that there are people out there who have information in relation to the activities of Ms. Hsin prior to her murder and know about the people who are involved,” said Peel police Insp. George Koekkoek.

Lu is due to appear in court on Thursday for a bail hearing. Police will also be holding a news conference on Thursday in connection with the homicide case.

Anyone with information is being asked to contact investigators at 905-453-2121 ext. 3205, or Crime Stoppers anonymously at 1-800-222-8477.

With a report from CTV Toronto’s Tamara Cherry