TMZ -- The husband of "Deal Or No Deal" suitcase model Katie Cleary shot himself to death ... just weeks after she was photographed getting cozy with Leo DiCaprio and Adrian Grenier.
Law enforcement sources tell TMZ ... Andrew Stern shot himself in the head Sunday while he was at a shooting range in the
The 40-year-old businessman was married to Katie ... who was also a contestant on "
We're told law enforcement interviewed various people after the suicide, including Katie, and they were told -- among other things -- he was suffering significant stress over marital problems.
Sources say Katie told law enforcement she and Andrew were in the process of getting divorced.
A source close to Leo tells us Katie and the actor never hooked up and he left the club with his GF Toni Garrn.
In addition to marital problems, law enforcement says Andrew had a history of depression and had financial issues.
Read more at TMZ.