The bad blood between Dr. David Healy and GlaxoSmithKline plc brewed up long before the psychiatrist took the stand in a Chicago federal court last week to testify that the pharmaceutical giant hid the risk of suicide in its blockbuster antidepressant Paxil.

Healy’s testimony is the bedrock of a claim brought by the widow of a Reed Smith partner who committed suicide in 2010 while taking a generic version of Paxil. GSK argues that Stewart Dolin’s death was the result of stress from a diminished role at the firm following a 2007 merger. Dolin’s widow, who claims her husband died from an adverse reaction to Paxil, is seeking $12 million from GSK.