FARMINGTON — A Shiprock man serving a four-year prison sentence for assault will serve an additional two years in prison after he pleaded guilty last week to a statutory rape charge.

Lancelot Lapahie, 26, pleaded guilty last week to having sex with a minor between August 2010 and December 2011, according to a news release from the U.S. Attorney's Office for the District of New Mexico.

The young girl was at least 12 years old but younger than 16 when Lancelot Lapahie had sex with her, according to court documents.

He was indicted on the rape charge in October 2013 while he was serving prison time for the assault conviction.

Lapahie was sentenced in May 2013 to more than four years in prison for two assault charges and possession of an unregistered firearm related to convictions that stemmed from a March 2012 incident.

Lapahie admitted he attacked Ricardo Sandman with a baseball bat and George Lapahie III, Lancelot's brother, with a machete during an argument in the late hours of March 23 and early hours of March 24 at the Lapahies' home in Shiprock, according to court documents.

Investigators called to the home found a sawed-off shotgun.

George Lapahie III is a paraplegic, according to court documents.

Lancelot Lapahie told FBI investigators that he attacked his brother after the man tried to "jump" him, according to court documents.

Lapahie will serve his sentence for the statutory rape conviction after he serves his sentence for the assault and firearm convictions, according to the U.S. Attorney's Office.

Ryan Boetel covers crime for The Daily Times. He can be reached at 505-564-4644 and Follow him on Twitter @rboetel on Twitter.