Jack Perry. He shot Mary Lane and he put the gun in Bill's hand.
6 seconds sound clip from the Reefer Madness (1936) movie soundboard.
You can hear this line at 00:59:10 in the Blu-ray version of the movie.
Quote context
[...]
- And I'll tell you who killed Mary Lane.
- It wasn't Bill. It was Jack.
- Jack Perry. He shot Mary Lane and he put the gun in Bill's hand.
- We were all at the apartment one afternoon.
- And Mary came in looking for her brother.
- Bill and I, we'd been in another room.
- And Bill came in, he caught Ralph with Mary. Then they started to fight.
- But it was Jack who had the gun. He was going to hit Bill over the head with it to make him stop.
[...]