Variety, Sunday evening:

Rob Reiner, who segued from starring in “All in the Family” to directing movies including “This Is Spinal Tap,” “A Few Good Men” and “When Harry Met Sally…” was found dead Sunday afternoon in his Brentwood home alongside his wife Michele Singer. He was 78.

The deaths are being investigated as a homicide, according to the LAPD. The couple was reported to have been stabbed to death.

Then this morning:

Nick Reiner, the 32-year-old son of Rob and Michele Reiner, is in custody after the apparent homicide of the director and his wife on Sunday afternoon.

Just tragic and heartbreaking on every level. Inconceivable, even.