Dateline: Secrets Uncovered - How did Martha Ann's son help detectives solve the suspicious death of

Bob McClancy's sudden death in 2006 was a confusing affair for family members, given that the cause of death remained unanswered. Bob's stepson, Sean McGavic, claimed that he only heard of the death the night before the funeral when his mother, Martha Ann, told him that the 56-year-old died of a heart attack. Medical examiners

Bob McClancy's sudden death in 2006 was a confusing affair for family members, given that the cause of death remained unanswered. Bob's stepson, Sean McGavic, claimed that he only heard of the death the night before the funeral when his mother, Martha Ann, told him that the 56-year-old died of a heart attack. Medical examiners ruled his death a suicide, but the cause remained undetermined.

Things only got worse when Chuck Kaczmarczyk, Bob's close friend and alleged war veteran, married Martha Ann within months after his death. In 2012, the duo were indicted on multiple federal charges, including fraud for reportedly trying to scam the government of social welfare and veteran benefits based on false claims.

Soon after, a shocking revelation was made when McGavic discovered incriminating pictures on his mother's computer from the day Bob died, and authorities were eventually able to get a confession out of Kaczmarczyk while he was already serving time in prison.

It was revealed that both Martha Ann and Kaczmarczyk reportedly murdered Bob by poisoning his food with his own prescribed medication, which gradually caused him to overdose.

This article will further delve into Bob McClancy's murder investigation that unraveled a web of lies and a sinister murder plot ahead of Dateline: Secrets Uncovered's upcoming episode, titled Secrets In The Smoky Mountains, which airs this Tuesday, January 10, at 11 pm ET.

A series of shocking revelations came to light in the years that followed the death of Bob McClancy in 2006

Vietnam War veteran Bob McClancy's suspicious death in 2006 remained a big question mark for both investigators and family members who were unable to accept the suicide theory. McClancy was found overdosed in his home with a gun on his lap close to one hand and pills scattered all over him. The incident was reported by his close friend Chuck Kaczmarczyk.

While the case was initially ruled to be a suicide, the events that later took place raised questions about the involvement of McClancy's then-wife Martha and Kaczmarczyk when the two married within months after his death. The couple started enjoying a lavish lifestyle with expensive exploits and vacations. Martha's son questioned her intentions and wanted answers.

The duo's dark secrets started to catch up on them when Kaczmarczyk's claims of being a war hero and having participated in risky military missions were challenged and proved false by other veterans who had reportedly served with him in the years that followed Bob's death and their marriage.

Chuck Kaczmarczyk had been collecting disability benefits from the VA based on falsified claims of PTSD when he never participated in combat and was not a war hero. Martha Ann, who claimed to be wheelchair-bound, was also receiving government funds. In 2012, the two pleaded guilty to federal charges and were serving time in prison when another shocking series of events made the news.

Bob McClancy's stepson helped detectives solve his case using incriminating photos from his mother's computer years later

While in federal prison, Martha Ann gave her son Sean McGavic, who was kept in the dark about his mother's hideous crimes, power of attorney, and with that authority came access to their medical files. After being told that his step-father Bob McClancy had died of natural causes, McGavic was shocked to learn that he had been actively trying to overdose.

Ultimately, Sean uncovered Bob's photos from 2006 that Kaczmarczyk captured before alerting the police. In the photos, Bob was lying in his recliner in various poses. He was holding a gun in some pictures, while in others, he wasn't. Authorities then asked McGavic to talk to his mother about the photos over a monitored phone call, during which Martha Anna instructed him to delete the photos.

Chuck Kaczmarczyk, who was also in prison, "implicated Martha Ann in the victim's murder and admitted that they had planned the murder together." The two allegedly plotted to kill Bob McClancy for financial gains. Martha being, Bob's wife, deliberately poisoned him using his prescribed medicines, hiding them in his food and progressively increasing the dosage until he overdosed.

Kaczmarczyk pleaded guilty to one count of conspiracy to murder as part of a plea agreement and received a 25-year jail term. Although Martha Ann insisted she was innocent, she was ultimately found guilty of attempting to commit first-degree murder and conspiracy to commit first-degree murder in 2015 and was sentenced to 50 years in prison.

The 2006 murder of Bob McClancy will feature on Dateline: Secrets Uncovered's upcoming episode on January 10 at 11 pm ET on Oxygen.

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