Johnny Carson broke into wife's apartment to investigate 'affair' with Frank Gifford, lawyer claims

Johnny Carson’s jealous secret

Johnny Carson supposedly thought his wife was cheating on him with Frank Gifford

A jealous, pistol-packing Johnny Carson — sure that his second wife, Joanne, was cheating on him — broke into her secret Manhattan apartment and found it full of pictures of the other guy: Giants football legend Frank Gifford.

So claims a lawyer who toiled for 18 years as consigliere to the moody king of late-night television until they had a falling-out.

Click here for more from the New York Post's Page Six.

In his new tell-all, “Johnny Carson,” Henry Bushkin writes that Carson hired him in 1962 and that one of his first jobs was to accompany Carson and a private eye to break into a pad Joanne was renting on the sly.

On seeing framed photographs of Gifford all over Joanne’s pied-a-terre, “Carson leaned against the living room wall and began to weep,” Bushkin writes.

When Carson’s raincoat fell open, “I was shocked to see that Johnny was carrying a .38 revolver in a holster on his hip,” Bushkin writes.

Joanne Carson, now 81 and living on Sunset Boulevard in Bel-Air, California denied to The Post Monday that she ever had an affair with Gifford, saying she had only been pals with the gridiron great.

Click here for more from the New York Post's Page Six.