CNN — Marcellus Williams, whose murder conviction was questioned by a prosecutor, died by lethal injection Tuesday evening in Missouri after the US Supreme Court denied a stay. The 55-year-old was put to death around 6 p.m. CT at the state prison in Bonne Terre. Williams’ attorneys had filed a flurry of appeal efforts based on what they described as new evidence – including alleged bias in jury selection and contamination of the murder weapon prior to trial. The victim’s family had asked the inmate be spared death. The US Supreme Court’s action came a day after Missouri’s supreme court and governor…