A 22-year-old Olathe man who was one of three arrested after a botched December 2012 robbery attempt pleaded guilty to felony conspiracy to commit robbery on Friday.

Connor M. Mayhan pleaded guilty to an amended charge as part of plea negotiations. Mayhan was initially charged with attempted aggravated robbery, attempted aggravated burglary and interference with law enforcement.

Mayhan was arrested with Alexander C. Eftekhar, 22, and Andrew Michael Johns, 21, after an alleged attempt to rob a Lawrence homeowner of money and marijuana went awry.

At a preliminary hearing for Eftekhar, Mayhan testified that he and Eftekhar conspired to rob the man and that they recruited another man to drive them to the home in the 1200 block of New Jersey Street. As they attempted to force their way inside the home, a firearm discharged and struck Mayhan in the arm. Police interviewed the men after Mayhan and Eftekhar left the scene and called to report that they had been robbed at their home in the 800 block of Mississippi Street.

Last month, District Judge Peggy Kittel found Eftekhar guilty after he pleaded no contest to amended charges of attempted robbery and attempted aggravated battery. Sentencing is set for March 28. Johns is scheduled to be arraigned on April 4.

The presumptive sentence for the crime is up to 34 months of probation, depending on criminal history. In court on Friday, Mayhan’s attorney, Sarah Swain, said he did not have a criminal history. Mayhan is free on a $15,000 bond and is scheduled to be sentenced on April 4.