Peterson was convicted of murdering his wife, Laci Peterson, and their unborn son, Conner, after Laci disappeared from Modesto, California, on or around Dec. 24, 2002.
The actor said he later came to understand that success and alcoholism were unrelated issues in his life, though it took years to separate the two in his mind.
Those who knew Lemieux say the retired hockey standout had been carrying personal burdens for years, including lingering disappointment over never being inducted into the Hockey Hall of Fame.
According to footage shared online, the artist experienced what appeared to be a technical issue involving an upright piano being used during the song.
Video from the scene showed protesters shouting insults and profanity at immigration officers while ignoring repeated warnings from police to leave the area.