What's on TV Tonight | July 31
XXX Summer Olympics 7-11pm, NBC. Women's gymnastics, swimming and women's diving competitions air live from London.
Rizzoli & Isles 8-9pm, TNT. Jane and Frankie investigate the murder of a childhood friend.
Trust Us With Your Life 8:30-9pm, ABC. Improv performers re-enact moments from David Hasselhoff's life.