KILLER dentist Colin Howell apologised to women patients he attacked in his surgery as he pleaded guilty to nine charges of indecent assault just moments before he was due to stand trial.

Killer dentist Colin Howell injected his lover with drugs to knock her out while they had sex and once feared he had overdosed her, a court heard today.

A dentist accused of murdering his wife and his ex-lover's husband pleaded guilty today to indecently assaulting three women patients at his surgery.