Patrick Arnold, Chemist Behind the BALCO Scandal, Dies at 59

Patrick Arnold, the chemist who invented THG, the undetectable steroid known as "the clear" at the center of the BALCO doping scandal, died at 59 in Guilford, Connecticut, with the cause of death unknown.

Arnold's creation of undetectable performance enhancing drugs gave athletes including Barry Bonds, Marion Jones, and Jason Giambi a significant edge over competitors, ultimately triggering a federal investigation in 2003 that led to Arnold serving three months in prison.

Described by his brothers as a mad scientist driven purely by the science rather than money or fame, Arnold left checks uncashed, occasionally relied on federal food assistance, and never fully escaped the psychological toll of government raids and the scandal's fallout.

Despite the notoriety, Arnold continued researching until his death, making early contributions to the ketogenic diet and later focusing on epilepsy, muscle wasting, and longevity.

Patrick Arnold, the chemist who built tetrahydrogestrinone, the undetectable steroid at the center of BALCO that stained Barry Bonds and Marion Jones, died May 12 at his family home in Guilford, Connecticut, aged 59; the cause is unstated The Athletic. He served three months in federal prison plus three of house arrest after the 2003 investigation, refused a deal requiring testimony against athletes, his attorney says, and posted about receiving food assistance six months before he died The Athletic. Sports Illustrated once headlined a profile Is This Dr Evil? The cleaner legacy may still be moving: a Navy funded ketone molecule he synthesized sits in early human trials for neurological disease The Atlantic, open until results land.