California Doctor Accused of Murder in Deaths of 3 Patients

Dr. Lisa Tseng is facing second degree murder charges; defense says patients took excessive doses, mixed with alcohol and other drugs.
1:28 | 09/03/15

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Transcript for California Doctor Accused of Murder in Deaths of 3 Patients
Next tonight here, the landmark trail in California, the doctor charged with murder, accused of killing three patients who overdosed on painkillers she prescribed. ABC's Mara schiavocampo on a case that could set a Twila smith and her class of 27 students, the hostage taker, a firearm who walked in and put a gun to smith's head. He said that he was going to kill people and elhimsf. What were you in there him to let everybody leave and he and I would stay. Anything I could think of, just telling him that he hadn't gone too far. Students began knocking on the door, but smith turned them back and was able to signal another teacher, Jen swift. He was standing by the bulletin board with the gun raised towards my head and sai you can get in here, too. Reporter: Swift ran for help police and the poster eventually get him to surrender. Smith credited with keeping her students alive. When they W They took excessive dosages. They mixed alcohol, other drugs. Reporter: Now the patient' families hope cases like this one can help save others. I don't want anybody else to lose their lives because of irresponsible prescribing. Reporter: Legal experts say this case could have an effect on doctors prescribing moving forward. If convicted she faces 45 years to life. When we come back here tonight, the wark worker warned

This transcript has been automatically generated and may not be 100% accurate.

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