Paul Katz knew he was in trouble. “If I’m not back in two hours, call the cops,” the mob associate told his wife before he headed out the door the night of Dec. 6, 1969.

He’d never be seen again.

On Tuesday, Katz’s son Lawrence, who was 5 years old at the time, told jurors in the Brooklyn federal court trial of accused Lufthansa heist planner Vincent Asaro, that his dad had a bad feeling about his meeting with the Bonanno wiseguy that night.

Prosecutors say Katz owned a warehouse that served as a stash house for stolen goods hijacked by Asaro and Lucchese associate James “Jimmy the Gent” Burke, who was famously played by Robert De Niro in the film “Goodfellas.”

After the Queens facility was raided in 1968, the notoriously murderous Burke became convinced that Katz was running his mouth to the law.

He was strangled with a dog chain, the feds have said, by Asaro as Burke looked on.

Some of Katz’s remains were finally found in a Queens basement in 2013 after Asaro’s cousin — mobster-turned-canary Gaspare Valenti — led agents there.

Valenti, who earlier in the case testified that Asaro took part in the theft of more than $6 million in jewels and cash from Kennedy Airport in 1978, told jurors that Katz’s corpse was initially buried in the Ozone Park basement before it was dug up and moved upstate.

Investigators found teeth, hair and clothing belonging to Katz in the Queens home during the 2014 dig.