Right To Die John Cuddy Mystery Series, Book 6.

While guarding an activist from an assassin, Cuddy makes himself the target To impress his girlfriend and remind himself of his long-neglected athleticism, John Francis Cuddy is training to run the Boston marathon. But the private detective's fitness regimen goes on the back burner when an old friend approaches him with a dangerous assignment. Euthanasia advocate Maisy Andrus has been receiving death threats, and the police are helpless to protec...