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Former Marine Nick Morelis was executed in his Tucson bedroom with eight projectiles and rare ammunition. Investigators linked workplace conflicts, a suspicious arm injury, and evidence pointing to James Lean. Michael Deakus was found shot on his porch, and a corrected timeline led to Amber's arrest. A country club bombing and business motives were explored, resulting in the conviction of Pam Phillips and Ron Young.

Marine Dion Cartmel and Shari Barber's secret wedding sparked family conflict and financial strain, escalating into a domestic dispute. Jealousy and distrust led to a fatal confrontation, resulting in a gunshot incident that ended in tragedy.

A former Marine is being questioned for the death of his mistress, Erin Corwin. Their affair intensified after she became pregnant. Lee confronted her about alleged inappropriate contact with his daughter, leading to her death by garrote. Her body was disposed of in a mineshaft.

A Marine sergeant in Texas faced charges of aggravated kidnapping or murder after a deadly love triangle emerged, with prosecutors questioning whether the death resulted from jealousy or a premeditated act for life insurance gain.

Marjorie Orbin claimed her husband left for a business trip and never returned. When part of his body was found in the Arizona desert, she became the prime suspect in the investigation into his disappearance.

A Los Angeles elementary school teacher accused of sexually abusing students was exposed after allegedly using 35-mm film photos of bound and gagged children, which he submitted to a drugstore for development, bypassing digital photo trends that could have obscured his actions.

Forensic pathologist Dr. Richard Shepherd examined the body of Mark Bradbury, whose death was ruled a murder committed by his friend Daniel Shovelton, who killed him to obtain his drugs. The investigation focused on the victim's body to uncover details about the crime.

Mark James Robert Essex, known as the New Orleans Sniper, killed nine people, including five police officers, and wounded twelve others in two attacks on December 31, 1972, and January 7, 1973.

Mark Hacking spent his life spinning lies, but after five years of marriage, his wife uncovered his true nature. Despite attempts to continue deceiving, he took a drastic step to prevent his lies from being exposed.

Mark Latunski lured a man into his home, committing cannibalism. His ex-wife Emily and daughter Eliza discuss the crime's impact on their family and whether prior signs of his violent intentions existed.

Mark Redwine's secret fetish was discovered by his son Dylan, despite his efforts to prevent Dylan from revealing the secret.

Mark Riebe, serving a life sentence for murdering a young mother, initially confessed to killing 12 other women but later retracted those claims. His case remains under investigation, with conflicting statements complicating the prosecution's case.