A Stamford man who poisoned dozens of members of a Darien church nine years ago has been arrested after a supermarket employee saw him kiss a stranger on the derriere as she bent to take an item off a shelf.

Wendell Woodroffe, 37, of East Main Street, Stamford, was charged with fourth-degree sexual assault and released after posting $5,000 bond. Wendell was convicted nine years ago of six counts of second-degree assault for spiking grape juice at a Darien CVS/Pharmacy where he worked, poisoning more than 40 members of Calvary Baptist Church.

Sgt. Robert Shawinsky said the woman was at ShopRite at 495 Hope St. when she felt something touch her buttocks for a split second. The 31-year-old turned around, but did not see anyone right next to her. But an employee who saw the momentary brush told the woman a man had just kissed her on the buttocks, Shawinsky said.

Store employees called police.

Shawinsky said that when police arrived, the suspect, who was identified by the store employee, was still in the store. Shawinsky said Woodroffe later admitted to police that he leaned over and kissed the woman’s behind.

At the time of Woodroffe’s arrest over the Darien incident, his attorney said Woodroffe did not have the mental capacity to understand the seriousness of his crimes. Woodroffe, who then was receiving counseling at the Dubois Center, told police he poured dishwashing liquid into the grape juice to get back at his bosses for not promoting him from shelf stocker. After members of the church drank the juice during a communion service, 44 people, half of them senior citizens, reported burning sensations in their throats, vomiting and nausea.

At the time, he also admitted to pouring mouthwash in a bottle of prune juice that sickened a Danbury woman in 2005. Calvary Baptist Church members urged the court to show mercy, and a judge sentenced Woodroffe to five years of probation.