More has come to light about Derek Sink’s death.

Three days after his body was found in a tanning bed at a Planet Fitness gym in Indianapolis, his mother shared more insight into the harrowing incident.

Karen Wetzel believes that her son’s toxicology report will come back with fentanyl in his system, she told People in an interview published Nov. 13. She emphasized that despite Sink’s history with drug addiction (a syringe was found in the room with him, according to his family), he was “a human being with value and worth.”

She recalled the 39-year-old as “the kindest person” with “the softest heart,” per the outlet.

Karen explained that Sink—who was charged with possession of a narcotic drug and possession of a controlled substance last year, according to Marion County Superior Court records, per NBC News—had gone to sign up for a gym membership on Nov. 8 while his girlfriend Heather and her daughter were in a TJMaxx nearby.