On an "eerie moonlit midnight" in 1993, lawyer Peter Low made a site visit to a murder scene at Choa Chu Kang Christian cemetery.
It helped Mr Low, now a senior lawyer and ex-Law Society president, to see why his client could not have stabbed the victim - a woman who cross-dressed as Jack.
His client and another man were being tried for the murder.
Mr Low, together with lawyer N. Sreenivasan, had been assigned by the Supreme Court Registrar to defend a so-called hired killer who was jointly charged for murder.
Either one would have stabbed the victim but only one knife was used in the attack.
Mr Low's client and the co-accused had blamed each other for the stabbing.
The co-accused had a motive as it emerged that the victim had refused to end a prolonged relationship with his sister and had been lured to the site to settle the matter.
"The site visit was invaluable. It... forced us to see as our client did, how the co-accused stabbed the victim, and how it was impossible our client did the killing."
The High Court judge accepted it was the co-accused only who stabbed the victim.
"Lesson learnt: Since then, especially in criminal cases, I have made many site visits to the scene of the crimes," said Mr Low.