"I don't have a dog in this race, so I don't want to be painted as a guy who's trying to mask anything, " Payne said when Jackson lawyer Brian Panish suggested he was downplaying concerns about Jackson's health in the days before he died.

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Attorney Brian Panish, who represents Katherine Jackson, said the drug problems worsened when the pop star was under the stress of live performances.

NPR: Jackson's Private Life On Display In Civil Trial

Brian Oxman, a former attorney for the Jackson family who was with the family in the hospital emergency room on Thursday, also expressed concern about medications the pop star was taking.

CNN: Questions swirl about Jackson and medication