If you watched television in the late 1980s, you probably remember the My Sister Sam TV show on CBS. The sitcom revolves around San Francisco freelance photographer Samantha “Sam” Russell (Pam Dawber). Sam’s world is turned upside down when her 16-year-old sister, Patti (Rebecca Schaeffer), comes to live with her. Others in the cast include Jenny O’Hara, Joel Brooks, and David Naughton. Executive produced by Diane English (pre-Murphy Brown), the series did well enough in its first season to be renewed but the ratings saw a big decline in year two and was cancelled in May 1988 with 12 installments left unaired.

While My Sister Sam didn’t last, it looked clear that Schaeffer was destined for bigger things. Tragically, in July 1989, the actress was fatally shot by an obsessed fan in the doorway of her Los Angeles apartment. He had been stalking her for three years.

Nearly 30 years after Schaeffer’s death, ABC’s 20/20 will explore this case. The episode airs tomorrow night, April 12th, at 9:00 PM.

ABC NEWS’ ‘20/20’ PRESENTS TWO-HOUR DOCUMENTARY ON REBECCA SCHAEFFER, A PROMISING YOUNG ACTRESS WHO DIED WHEN A STALKER SHOT HER POINT BLANK AT THE DOOR OF HER LOS ANGELES HOME

‘20/20’ Uncovers the Details of Her Stalker’s Fixation and How Stalking Laws Have Changed in the Aftermath of Her Death

‘20/20’ Airs Friday, April 12 (9:00 – 11:00 p.m. EDT), on ABC

As celebrity stalkers regularly make headlines, a two-hour “20/20” documentary takes a look at one of the first celebrity stalking cases almost 30 years ago. Rebecca Schaeffer, a promising young actress known for her role on the hit sitcom “My Sister Sam,” was preparing to audition for the movie role of a lifetime, a part in “The Godfather Part III,” when her longtime stalker, an obsessed fan named Robert John Bardo, trekked across state lines and shot her point blank at the door of her Los Angeles home, killing her. “20/20” looks back at Rebecca’s life and budding career, and uncovers the details of Bardo’s fixation, exploring the startling truth behind what it’s like to have a stalker and how stalking laws have changed in the aftermath of Rebecca’s death. “20/20” airs Friday, April 12 (9:00 – 11:00 p.m. EDT), on ABC.

“20/20” includes new interviews with actress Pam Dawber, star of “Mork & Mindy” and Rebecca’s co-star in “My Sister Sam”; director Brad Silberling, Rebecca’s boyfriend at the time of her death; Benson Schaeffer, Rebecca’s father; actress Dyan Cannon, who directed Rebecca in the film “The End of Innocence”; Erika Slezak, former star on the soap opera “One Life to Live,” Rebecca’s first TV show; and Marcia Clark, former Los Angeles prosecutor who successfully prosecuted Bardo for Rebecca’s murder and later became well-known during the O.J. Simpson trial. The documentary also features a new interview with Olympic gold medalist Shawn Johnson, who opens up about what it’s like to come face-to-face with a stalker, 10 years after her stalker made headlines when he traveled across the country and broke into a Los Angeles studio lot to find her, with two loaded guns in his car.

On July 18, 1989, as Rebecca eagerly prepared to meet with director Francis Ford Coppola and audition for the highly coveted role of Mary Corleone, Bardo was en route to Los Angeles from Tucson, determined to find Rebecca. Using the address he received from a private investigator he had hired, he found himself face-to-face with her at her doorstep. After a brief conversation, Bardo left and Rebecca, who didn’t know Bardo was stalking her, continued on with her day. Tragically, when Bardo returned just a few hours later, he shot her in the chest when she answered the door. The news of Rebecca’s murder created shockwaves across Hollywood and eventually changed the precautions put in place to protect celebrities from stalkers.

Police became aware of Bardo’s involvement in the crime when he ran through the streets of Tucson while shouting that he killed Rebecca. When he was apprehended, they found a photo of Rebecca in his pocket. Bardo was convicted of first-degree murder and received life in prison without the possibility of parole.

The special on Rebecca Schaeffer is part of “20/20”’s two-hour documentary programming. The original eight-week two-hour programming lineup has been extended to 15 weeks and will run through April 12. Since the two-hour documentaries premiered on Jan. 4, “20/20” has been Friday’s No. 1 newsmagazine each week in all key demos: Total Viewers, Adults 18-49 and Adults 25-54.

“20/20” is anchored by David Muir and Amy Robach. David Sloan is senior executive producer.

What do you think? Do you remember Rebecca Schaeffer or the My Sister Sam TV show? Will you watch this installment of 20/20 on ABC?