Dennis Sochor was executed by lethal injection for the 1982 murder of 18-year-old Patty Gifford, who was raped and strangled. Her body was never found.

The series of executions, due to be carried out by the end of this month, highlights the nation’s aging death-row population.

One of Florida's prisoners scheduled to die in July, a man convicted of killing his ex-girlfriend's parents in 1986, is 80 years old and would be only the second known…