Members of the jury, we are here to seek the answer to a transcendent question: Who killed the Batman? -- and to bestow full honor and recognition for this glorious achievement! 
Batman #291 is an issue of the series Batman (Volume 1) with a cover date of September, 1977. It was published on June 7, 1977.
Synopsis for "The Testimony of the Catwoman!"
The report goes out from coast-to-coast in the underworld that Batman has been killed. But scores of contradictory versions spring up as to who did it, how it was done, or if it was done at all. To settle the controversy, Col. Jake "the Claw" van Cleeve, a top Gotham mobster, provides his estate as a court of crime to determine the truth or falsity of the reports from the top contenders, Catwoman, Lex Luthor, Riddler, and Joker.
The judge is Ra's al Ghul, the prosecutor is "Two-Face", and the jury is composed of Mad Hatter, Spook, Poison Ivy, Scarecrow, Signalman, and Mr. Freeze.
Catwoman, in widow's weeds proceeds to give her testimony: After Batman recently broke up one of her rackets, she packed up her belongings and prepared to flee. Batman followed her to her hideout and took out her thugs while she escaped with her cats and treasure. Batman blocked the road with his Batmobile and forced them both off a bridge. She says that she bobbed to the surface and clung to a floating jaguar cage for safety. When Batman attempted to do the same, she made a tough decision, him, her jaguar, or a years' worth of treasure. She kicked him off, and watched him drown.
"Two-Face" demolishes her testimony by demonstrating that her jaguar cage, made of Brazilian pepper tree wood, is too heavy to float and could not have supported her in the water. Her phony testimony is an attempt to convince the underworld that she is capable of killing, thus convincing top criminal talents, who have hitherto shunned her, to flock to her banner. The jury declares Catwoman not guilty, and Ra's al Ghul dismisses her and adjourns the court till the next claimant can be heard.
Appearing in "The Testimony of the Catwoman!"
Featured Characters:
- Batman (Behind the scenes)
Antagonists:
- Catwoman
- Joker
- Lex Luthor
- Mad Hatter II
- Mister Freeze
- Poison Ivy
- Ra's al Ghul
- Riddler
- Scarecrow
- Signalman
- Spook
- "Two-Face"
Other Characters:
- Captain Stingaree
- Cavalier (In a vision)
- Killer Moth
- Two-Face (Behind the scenes)
- Colonel Jack van Cleeve (Single appearance)
Locations:
- Gotham City
- Cleeve Mansion
- Chicago
- Boston
- New Orleans
- San Francisco
- Miami
Items:
Vehicles:
- Batmobile (In a vision)
Notes
- This is the first part of the storyline called "Where Were You On The Night Batman Was Killed?"
- This issue is reprinted in The Strange Deaths of Batman.
- Starting with this issue, the tag that reads "Batman created by Bob Kane" starts to appear in the Batman comics.
- This issue is the lead story in that week's Daily Planet column.
Trivia
- There's a small, fat bald man among the villains. This character seems likely to be one of the Tweed Brothers, but there is no clarification as to which one of them.
- The storyline that starts with this issue is notable for being the first historical large gathering of Batman villains, with more than ten characters.