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Alameda County fire investigator goes through burned debris as the owner looks at the damage of an early one-alarm house fire on Neptune Drive in San Leandro, Calif., on Wednesday, Feb. 6, 2013. Firefighters found an adult man in the home who was taken to a local hospital.(Laura A. Oda/Staff)

SAN LEANDRO -- A 65-year-old man died after a one-alarm fire destroyed his small home behind the marina on Wednesday morning, authorities said.

The man, identified by the coroner as Dennis Rosucci, was pulled from a back bedroom window of the single-story home in the 13000 block of Neptune Drive shortly after the fire was reported by a neighbor about 4:53 a.m., said Alameda County Fire spokeswoman Aisha Knowles.

The man lived alone and no one else was injured, authorities said.

The man was taken to San Leandro Hospital where he was pronounced dead a short time later, Knowles said. A cause of death had not been determined late Wednesday, a coroner's spokeswoman said.

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Firefighters arrived to find heavy flames and smoke coming through the front door and window of the two-bedroom home and more flames shooting from a rear window, Knowles said.

Yoshi Ko, 65, who lives next door, said she was awakened by what she thought was the sound of raccoons trying to get into trash cans on the side of the house. When she went outside to look, the neighboring home's living room was engulfed in flames and the grass was on fire, she said.

Ko said she banged on a nearby neighbor's door and screamed for him to call 911, then tried to fight the fire with a garden hose.

"It's just sad," she said as she glanced at what was left of the home on Wednesday.

Crews put out the fire in 20 minutes.

Fire officials believe the fire started in the living room but the cause of the fire was still under investigation late Wednesday. It did not appear to be suspicious, fire officials said.

Anyone with information is asked to call 510-670-5858.

Staff writer Kristin J. Bender contributed to this report. Reach Natalie Neysa Alund at nalund@bayareanewsgroup.com. Follow her at Twitter.com/nataliealund.