Jeremiah Oliver was just 5 years old when he was murdered and found stuffed in a suitcase on a Massachusetts highway more than nine years ago. His alleged murderer has finally been chargedâAlberto Sierra Jr., 32, pleaded not guilty at his arraignment Thursday. Heâs now being held without bail after being arrested Wednesday, law enforcement said. âThis case rocked the conscience of the city of Fitchburg,â police chief Ernest Martineau said. âAt one point, we were Jeremiahâs family, 45,000 residents in the city, and we are here today, beginning the process of healing.â Sierra dated Oliverâs mother, who herself pleaded guilty in 2017 to assault and battery and reckless endangerment of her other children. She was sentenced to more than seven years in prison.