LOS ANGELES — Filmmaker Rob Reiner and his wife, Michele Singer Reiner, were found dead in their Los Angeles home on Sunday, according to a source close to the Reiner family.

The source said the couple appeared to have died from stab wounds.

Los Angeles police officials said Sunday they had responded to a report of two deceased at Reiner’s Brentwood home but did not identify them. LAPD said a homicide investigation is underway.

Paramedics were called to Reiner’s home on the west side of L.A. around 3:30 p.m.. A few minutes later police officers were dispatched.

The street where Reiner’s home is located was blocked off with caution tape, and several police cars were stationed in the area on Sunday evening.

Reiner, 78, is a longtime actor and director known for his films “The Princess Bride,” “When Harry Met Sally,” and “A Few Good Men,” which was nominated for an Academy Award for best picture.

Reiner is married to producer Michele Singer Reiner, 68, and they share three children. He also adopted a child from his first marriage to ex-wife Penny Marshall.

This year, Reiner appeared in four episodes of the Hulu TV show “The Bear” and in “Spinal Tap II: The End Continues,” which he also directed.

NBC News has reached out to a representative for Reiner for comment.