"Abused" (9 p.m., A & amp;E): When Richard Turner Jr. was fatally shot at point-blank range,

"Abused" (9 p.m., A & amp;E): When Richard Turner Jr. was fatally shot at point-blank range, his girlfriend was arrested and charged with the crime. Susan Greenberg negotiated a plea bargain, avoiding the death penalty but getting a life sentence for first-degree murder. This documentary follows Greenberg's quest for an early prison release as she cites evidence of abuse that she says drove her to the murder.
"Searching for Da Vinci's Secret" (9 p.m., Travel Channel): In hopes of learning the truth about Leonardo da Vinci and the myths surrounding him, amateur historians set out to find the legendary Holy Grail in this special. Beginning in the artist's hometown of Vinci, Italy, the historians travel to a number of offbeat locales and encounter people who claim a bloodline to Jesus.
"Texas Ranch House" (9 p.m., PBS): This is another one of those turn-back-the-clock shows that attempt to deliver a history lesson, along with all the reality TV bitterness, tension and deceit. This one has its participants donning vintage-1867 garb, driving cattle and making a home on the range.
"The New Adventures of Old Christine" (9:30 p.m., CBS): Looks like Julia Louis-Dreyfus has a hit on her hands, and we can end all this talk about a "Seinfeld" curse. Tonight, Christine does her very best to act like an adult when her ex-husband finally gets around to introducing his new girlfriend to their son.