Tulsi Gabbard said she was seeking further information from the FBI and other US agencies.
Although he did not become an actor until his 30s, Hackman became one of Hollywood's most bankable stars.
The pair, who murdered their wealthy parents in 1989, are pursuing three possible routes that could see them leave prison.
Authorities say there was no sign the couple had sustained any injuries, but no cause of death has been given.
Although he did not become an actor until his 30s, Hackman became one of Hollywood's most bankable stars.
The band, whose hits include Slam Dunk (Da Funk), haven't toured as a five-piece since 2001.
The band, whose hits include Slam Dunk (Da Funk), haven't toured as a five-piece since 2001.
The show dramatises the real-life legal battle families waged over birth defects in a steel town.
The show dramatises the real-life legal battle families waged over birth defects in a steel town.
Chloe Webb now runs a specialist store - and travels the world buying and selling Pokémon cards.