Lie Down, Killer — Richard S. Prather

HE STARED AT THE TWO COPS IN BEWILDERMENT

"What's this all about? You guys playing a joke or something?"
The big one twisted his head around. He wasn't grinning and his voice was thin and vicious. "That's what it is," he said. "A joke. A big one. A nice big joke on you, killer!"
But Steve had an alibi. He could still feel the moist heat of her lips against his skin, and her hand clutching against his back.
"Ask Margo," he told them. "She'll tell you where I was all night. Go ahead, ask her."
The other cop looked at Steve with a pitying glance. "That woman gag is pretty old stuff, Buster. We already asked her."
"Well?"
"She says you went home early."