There are several synonyms for the phrase "untimely ends." One related phrase is "premature death." Other synonyms may include "sudden demise," "unexpected passing," "abrupt departure," or "tragic loss." Each of these phrases conveys the idea that someone has died before their time or in a way that was unexpected or tragic. These synonyms can be used in various contexts, such as obituaries or news articles reporting on the death of a public figure. However, it's essential to keep in mind the sensitivity of the situation and choose language that is appropriate and respectful.