The death of an Arizona State University student whose body was found below the South Rim of the Grand Canyon nearly two weeks after he vanished has been ruled a [self-inflicted], according to newly released autopsy findings.

Sandarsh Krishna, 26, died from multiple blunt force injuries sustained in a fall from a height, the Coconino County Medical Examiner's Office concluded in an autopsy report obtained by The Arizona Republic.

Krishna was a master's student in computer science at Arizona State University who disappeared during a last-minute trip to Grand Canyon National Park just weeks before he was due to graduate. 

His family said he had already secured a job after graduation and had planned to continue on to Las Vegas.

According to the medical examiner's report, Krishna checked into Bright Angel Lodge on April 27 and was last known to be alive that day. 

His family reported him missing on April 28 after they were unable to reach him and told authorities they were concerned he may have been suicidal.

A park visitor found his backpack on the South Rim that same day near the area where his body would later be discovered, the report said.

National Park Service personnel recovered Krishna's body below the South Rim near Verkamp's Visitor Center on May 9 before transferring it to the Coconino County Medical Examiner's Office.

The National Park Service later confirmed his identity and said the investigation would remain open pending the autopsy findings.

Before his body was found, relatives publicly appealed for help and released what they described as a more detailed timeline of his final known movements.

According to 12News, the family said Krishna was confirmed to be in his room at Bright Angel Lodge at about 11pm on April 27 and investigators believed he disappeared around 11.30pm. 

'This information may seem small, but timelines matter,' his sister-in-law, Dr Pooja Shivananjappa, told the station.

'Even narrowing the window by minutes can help search teams and investigators better understand what happened.'

The family also offered a $5,000 reward for information leading to the identification of the person who found and turned in Krishna's backpack.

Authorities emphasized the individual was not considered a suspect or believed to be connected to the disappearance, but said they hoped the person could provide additional information about where and how the backpack was found, according to 12News.

When Krishna was initially reported missing, the National Park Service said he was last seen along the Rim Trail near Hermit Road, between Bright Angel Lodge and Mohave Point, sometime between the afternoon of April 27 and the early hours of April 28.

Officials said there was no known vehicle associated with him, leading investigators to believe he may have travelled around the park by rideshare or taxi.

He was described as 5ft 10ins tall with black hair and brown eyes and was believed to be wearing athletic clothing.

The National Park Service has not released any further information since the medical examiner completed its investigation.

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