Julia MacIsaac was a compassionate and kind-hearted woman who worked at the University Health Network (UHN) as a medical lab technologist She dated David Slinger for approximately 10 years. The two broke up in 2017.Following the breakup, MacIsaac purchased a three-bedroom townhouse on Scarborough Golf Club Road where she allowed 45-year-old David Slinger to stay in a separate bedroom down the hall from her own.MacIsaac had an independent locking mechanism on her second-floor bedroom which she had used to lock her bedroom from the inside.In a downtown courtroom Friday, that ex-boyfriend pleaded guilty to second-degree murder, admitting he brutally killed…