Paranormal investigators featured on ‘Ghost Adventures’ dead in apparent murder-suicide

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Debby and Mark Constantino, estranged husband and wife who've appeared on the Travel Channel series "Ghost Adventures," have been found dead in an apparent murder-suicide.

The Associated Press reports that Reno, Nev. police responded to a hostage situation at the Constantino's adult daughter's apartment, hours after another man's death in Reno. The police aren't releasing the details of the third man's death, only that it is "directly related" to the Constantino situation.

Reno Police Lt. William Rulla tells the Gazette Journal that an unnamed woman found the man, her roommate, dead in their apartment and reported that their third roommate, Debby Constantino, was missing. Officers used Debby's cell phone to track her to the apartment where she died.

Upon arrival at the apartment, the officers heard gunshots and heard a man yelling at them to leave. The man told the officers, "Give me 15 minutes to gather my thoughts, or I'll kill her."

The police stormed the apartment, but the couple was dead by the time they got inside.

A restraining order had been served by Debby against her husband last week and the two were scheduled to appear in court in December to begin divorce proceedings. Rulla tells the Reno Gazette Journal that Debby was also previously involved in a kidnapping and domestic violence incident at the hands of her estranged husband.

The Constantinos were paranormal experts for "Ghost Adventures," specializing in electronic voice phenomena. The ghost series hosts have tweeted their condolences.