A crumpled note, written with eyeliner, recovered from a bag belonging to Suchana Seth indicates that she was upset over the custody of her four-year-old son, whom she allegedly put to death, a Goa police official said on Friday.

Seth, 39, was arrested on Monday night for killing her son in a service apartment at Candolim in North Goa. She and her husband are estranged and their divorce proceedings are currently underway.