After she nabbed the man, he allegedly made sexual remarks to her and stared at her body.
The bizarre scene was spotted across from the Buddha Tooth Relic Temple in Chinatown.
The 46-year-old male driver was arrested for driving without due care and attention causing death.
The stall thanked the police for their "promptness and efficiency" in identifying the man.
The victim's family are still seeking help in identifying those involved in the incident.
Rescue and relief efforts are currently underway, but landslides and damage to roads are causing delays.
"I find it implausible that there could have been some ex-post collusion by hundreds of people," Prof Lim said.
The arrest was made on 15 Aug, a day after a video of the incident went viral on Threads.
President Tharman also posted on Facebook after the match to wish the Lions well for the second leg.
She initially suspected the elderly man of being a thief trying to steal their belongings from a park bench.