A joyful reunion with birth parents leads to incest, murder

In this April 19, 2018 photo, Alyssa Pladl poses at a park in Richmond, Va. Alyssa Pladl, the ex-wife of Steven Pladl, who police say killed three people and himself after an incestuous marriage to his biological daughter says he had an explosive temper and a history of abusive behavior. (AP Photo/Steve Helber)
In this April 19, 2018 photo, Alyssa Pladl poses at a park in Richmond, Va. Alyssa Pladl, the ex-wife of Steven Pladl, who police say killed three people and himself after an incestuous marriage to his biological daughter says he had an explosive temper and a history of abusive behavior. (AP Photo/Steve Helber)
FILE - This photo provided by the Wake County Sheriff's office shows Katie Pladl, who was fatally shot in Connecticut along with her adoptive father. Police said Steven Pladl killed his biological daughter, Katie, and her adoptive father in Connecticut, then fatally shot himself in New York state. Steven and Katie Pladl's 7-month-old son was found dead in North Carolina. (Wake County Sheriff's Office/Hartford Courant via AP)
FILE - This photo provided by the Wake County Sheriff's Office shows Steven Pladl. Police said Pladl killed his biological daughter, Katie, and her adoptive father in Connecticut, then fatally shot himself in New York state. Steven and Katie Pladl's 7-month-old son was found dead in North Carolina. (Wake County Sheriff's Office/Hartford Courant via AP)
This June 2016 image provided by Alyssa Pladl, shows Katie Pladl and her father Steven Pladl in Richmond, Va. Steven Pladl, was charged with incest after he impregnated his biological daughter, Katie. Pladl killed the 7-month-old son he had with Katie, then killed Katie and her adoptive father in Connecticut and killed himself in New York. (Alyssa Pladl via AP)
This September 2016 photo provided by Alyssa Pladl, shows Katie Pladl in Richmond, Va. Steven Pladl, was charged with incest after he impregnated his biological daughter, Katie. Pladl killed the 7-month-old son he had with Katie, then killed Katie and her adoptive father in Connecticut and killed himself in New York. (Alyssa Pladl via AP)
FILE - In this Thursday morning, April 12, 2018, file photo, police work at the scene where a man and a woman were found slain in a pickup truck near the intersection of Routes 55 and 7 in Gaylordsville, near New Milford, Conn. Police say Steven Pladl killed his biological daughter, Katie, and her adoptive father in Connecticut, then fatally shot himself in New York state. Steven and Katie Pladl's 7-month-old son was found dead in North Carolina. (Carol Kaliff/Hearst Connecticut Media via AP, File)

A joyful reunion with birth parents leads to incest, murder

In this April 19, 2018 photo, Alyssa Pladl poses at a park in Richmond, Va. Alyssa Pladl, the ex-wife of Steven Pladl, who police say killed three people and himself after an incestuous marriage to his biological daughter says he had an explosive temper and a history of abusive behavior. (AP Photo/Steve Helber)
In this April 19, 2018 photo, Alyssa Pladl poses at a park in Richmond, Va. Alyssa Pladl, the ex-wife of Steven Pladl, who police say killed three people and himself after an incestuous marriage to his biological daughter says he had an explosive temper and a history of abusive behavior. (AP Photo/Steve Helber)
FILE - This photo provided by the Wake County Sheriff's office shows Katie Pladl, who was fatally shot in Connecticut along with her adoptive father. Police said Steven Pladl killed his biological daughter, Katie, and her adoptive father in Connecticut, then fatally shot himself in New York state. Steven and Katie Pladl's 7-month-old son was found dead in North Carolina. (Wake County Sheriff's Office/Hartford Courant via AP)
FILE - This photo provided by the Wake County Sheriff's Office shows Steven Pladl. Police said Pladl killed his biological daughter, Katie, and her adoptive father in Connecticut, then fatally shot himself in New York state. Steven and Katie Pladl's 7-month-old son was found dead in North Carolina. (Wake County Sheriff's Office/Hartford Courant via AP)
This June 2016 image provided by Alyssa Pladl, shows Katie Pladl and her father Steven Pladl in Richmond, Va. Steven Pladl, was charged with incest after he impregnated his biological daughter, Katie. Pladl killed the 7-month-old son he had with Katie, then killed Katie and her adoptive father in Connecticut and killed himself in New York. (Alyssa Pladl via AP)
This September 2016 photo provided by Alyssa Pladl, shows Katie Pladl in Richmond, Va. Steven Pladl, was charged with incest after he impregnated his biological daughter, Katie. Pladl killed the 7-month-old son he had with Katie, then killed Katie and her adoptive father in Connecticut and killed himself in New York. (Alyssa Pladl via AP)
FILE - In this Thursday morning, April 12, 2018, file photo, police work at the scene where a man and a woman were found slain in a pickup truck near the intersection of Routes 55 and 7 in Gaylordsville, near New Milford, Conn. Police say Steven Pladl killed his biological daughter, Katie, and her adoptive father in Connecticut, then fatally shot himself in New York state. Steven and Katie Pladl's 7-month-old son was found dead in North Carolina. (Carol Kaliff/Hearst Connecticut Media via AP, File)