[x]

There is some evidence that the Secret Service killed both Marylin Monroe and Jane Mansfield in order to keep them away from JFK.

Kennedy died in 1963. Jayne Mansfield died in 1967.

The Kennedys probably had connections to hitmen who could do their work more reliably and with fewer chances for leaks.

[GingisK]

Ah. In the case of Mansfield it could have been “protecting the legacy”.