NORFOLK -- Traces of heroin and a syringe were found in the cabin where two Virginia Beach-based security contractors were found dead last week.

Former Navy SEALS, 44-year-old Jeffrey Reynolds and 43-year-old Mark Kennedy died on board the Maersk Alabama last week, while it was in the island nation of Seychelles.

Police are investigating whether a heroin high led to the respiratory failure that killed them.

According to doctors in the State Medical Examiners' office, heroin is a depressant that suppresses your central nervous system. As a result, your lungs don't perform the normal regulation of breathing.

Data from the Substance Abuse and Mental Health Administration says the number of people using heroin in the past decade has gone up 50 percent.

About 80 percent of users started by first using prescription painkillers like Vicodin and Percocet -- often called heroin's gateway drugs.

The Maersk Alabama is the ship featured in the 2013 movie, 'Captain Phillips.'

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