A prison officer was arrested on suspicion of plotting with an inmate to use drugs to pay someone outside the prison to kill her husband.

Authorities said Linda Brock, 43, had a sexual relationship with the Corcoran State Prison inmate in recent months and the pair eventually developed the unsuccessful murder-for-hire scheme.

Corrections investigators and county authorities arrested Brock on Saturday at the prison, and later found more than a pound of marijuana and 7 ounces of heroin at her Bakersfield home.

Prosecutors said Brock and the inmate, whom they did not identify, also organized a separate unsuccessful plot in which she would smuggle in knives the inmate was to use to kill rival gang members.

Brock faces charges including solicitation of murder, sex with an inmate, conspiracy to commit a crime, and offering to distribute a controlled substance, said Kings County Chief Deputy District Attorney Patrick Hart. Brock was held on $500,000 bail.

The inmate probably won't be charged and may be used as a witness against Brock, Hart said.