Capitalizing on Mantell's enfeebled state, Owen set about systematically expunging Mantell's contributions from the record, renaming species that Mantell had named years before and claiming credit for their discovery for himself. Mantell continued to try to do original research but Owen used his influence at the Royal Society to ensure that most of his papers were rejected.
In 1852, unable to bear any more pain or persecution, Mantell took his own life. His deformed spine was removed and sent to the Royal College of Surgeons where—and now here's an irony for you—it was placed in the care of Richard Owen, director of the college's Hunterian Museum.
But the insults had not quite finished. Soon after Mantell's death an arrestingly uncharitable obituary appeared in the Literary Gazette. In it Mantell was characterized as a mediocre anatomist whose modest contributions to paleontology were limited by a "want of exact knowledge." The obituary even removed the discovery of the iguanodon from him and credited it instead to Cuvier and Owen, among others. Though the piece carried no byline, the style was Owen's and no one in the world of the natural sciences doubted the authorship.