The remains of a baby have been discovered after a missing aristocrat was found and arrested this week, British authorities confirmed. Constance Marten, 35, and her sex offender boyfriend Mark Gordon, 48, were detained on Monday after police spent weeks scouring the U.K. for the pair and their newborn child. Police have yet to carry out a post-mortem examination to find out what happened to the infant. Marten and Gordon were initially arrested on suspicion of child neglect but were re-arrested on Tuesday on suspicion of gross negligence manslaughter. “Based on our inquiries we’ve carried out so far, we believe, sadly, the baby may have been dead for some time before they were found,” Scotland Yard’s Detective Superintendent Lewis Basford said Thursday. “It is too early to provide a more specific date.” Basford added that officers are “truly devastated by the outcome” of their search.