They say things happen in threes. You undoubtedly know about the passing of Pat Quinn and likely Viktor Tikhonov. 77 year old former Bruins and North Stars player Murray Oliver also passed away.
Oliver, who also played with Detroit and Toronto back in the 1960s, played in 1127 NHL games, scoring 274 goals and 454 assists. He participated in 5 All Star Games in his career.
Oliver died of a heart attack. Here's my full biography of Murray Oliver.