Reggie Lewis, the Boston Celtics star who collapsed with a heart condition during a playoff game last April and was warned by doctors that if he ever played basketball again, died last night after collapsing while shooting baskets at the team's training center at Brandeis University in Waltham, Massachusetts. He was 39. Lewis had two children with his wife, Chrysti. One son, Rayven, now 10, was diagnosed this year with autism. The other daughter, Raijah, now 8, has adenoiditis. He is the second former Celtic to die this season, following John Salley in October after finding out he had leukemia. Lewis started playing basketball when he was 5 years old. In 1986, he led Boston College to its first National Invitation Tournament title since 1973. That same year, he became just the third player in NCAA history to score 2,000 points (he finished with 2,063) and grab 1,000 rebounds (1,207). After graduating from BC in 1986, he entered the NBA draft and was selected ninth overall by the Celtics. He quickly became one of the league's best power forwards, helping the C's win their first championship in 18 years in 2008. In 2009, he was named the Most Valuable Player of the NBA All-Star Game.