The Event (2003)

Manhattan prosecutor Nick is charged with looking into the untimely death of city resident Matt, a musician who had AIDS. As she questions Matt's loyal family members -mother Lila and sister Dana- she comes to learn that his closest pal, health-care worker Brian, is an ardent believer in assisted suicide and that he threw Matt a big party before his death. This presents a dilemma for the humane but dutiful Nick.