A veteran BBC broadcaster was arrested on suspicion of murder Wednesday after admitting he had carried out a "mercy killing" on a lover suffering from AIDS. Ray Gosling, 70, says he smothered his bed-ridden partner with a pillow, and police would never had known it had not Gosling confessed during a broadcast on BBC East Midlands' Inside Out program on Monday. "Maybe this is the time to share a secret that I have kept for quite a long time," Gosling said. "I killed someone once... He was a young chap, he'd been my lover and he got AIDS." Assisted suicide has been repeatedly challenged in court, but it remains illegal in Britain and can put people behind bars for up to 14 years.