At the very least, they should be protected via a Citizen's Arrest:
A person can arrest someone that they reasonably suspect of committing a felony, even if the felony didnt occur in the presence of the individual making the arrest. As long as a felony was actually committed and the individual making the arrest knew of the crime, a reasonable suspicion about the identity of the perpetrator will justify their arrest....
Other states allow people making a citizens arrest to use deadly force to stop a fleeing arrestee as long as the person making the arrest used reasonable methods in order to make the arrest. Some states go further and require that the person using deadly force first attempt to restrain the subject of the arrest, and other states require pursuit and an explicitly stated intent to arrest before using deadly force.
And as it stands, they're saying he took his own life.