Maurice Brighthaupt - one of the last people to see Smith alive - testified Friday in the trial of Howard K. Stern and two doctors accused of conspiring to supply Smith with massive amounts of drugs, including powerful sedatives and painkillers.
They are not charged with causing her 2007 overdose death.
Brighthaupt says Smith popped pills for years. He says she fell into a depression following the 2006 death of her son and began taking 20 pills at a time and spending most of her time sleeping.
Brighthaupt says Stern sometimes gave her the pills and he once saw Smith's psychiatrist provide Smith with chloral hydrate.