Walter Matthau (; born Walter John Matthow; October 1, 1920 – July 1, 2000) was an American actor and comedian, best known for his role as Oscar Madison in The Odd Couple and its sequel 30 years later, The Odd Couple II, and his frequent collaborations with Odd Couple co-star Jack Lemmon, particularly in the '90s with Grumpy Old Men and its sequel Grumpier Old Men. He won the Academy Award for Best Supporting Actor for his performance in the 1966 Billy Wilder film The Fortune Cookie. Besides the Oscar, he was the winner of BAFTA, Golden Globe and Tony awards.
In addition to colon cancer, Matthau suffered from atherosclerotic heart disease during the last years of his life. On the late evening of June 30, 2000, he suffered a heart attack at his home and was taken by ambulance to the St. John's Health Center in Santa Monica where he died a few hours later at 1:42 a.m. on July 1, 2000. He was 79 years old. His remains are interred in the Westwood Village Memorial Park Cemetery in Los Angeles.
Less than a year later, the remains of Jack Lemmon (who died of colon and bladder cancer) were buried at the same cemetery. After Matthau's death, Lemmon as well as other friends and relatives appeared on Larry King Live in an hour of tribute and remembrance; many of those same people appeared on the show one year later, reminiscing about Lemmon. Carol Marcus, also a native of New York, died of a brain aneurysm in 2003. Her remains are buried on top of those of her husband, Matthau. The remains of actor George C. Scott are buried to the left of those of Walter Matthau, in an unmarked grave.