Brave and the Bold #111 (1974)

"Death Has the Last Laugh," script by Bob Haney, art by Jim Aparo, cover by Jim Aparo.

When an entire family is murdered with the Joker's modus operandi, Batman vows that his old foe has gone too far and that he'll make him pay for the crime that he's committed.  However, realizing that something was off about the dead bodies - none of them had the signature Joker-grin of his usual murder victims- Batman returns to the morgue to find that they suddenly do have grins! Suspecting a frame-up, Batman continues his search for the Joker. Can the caped crusader trust his greatest nemesis to solve this gruesome case? Should he?

Last 20-cent cover price. Good condition.