A 14-year-old juvenile offender accused of killing another teen-ager -- two days after removing his home-detention electronic monitoring device -- pleaded guilty yesterday to second-degree murder in Baltimore Circuit Court and was given a 12-year prison term.

The young killer, Armad Cloude, also pleaded guilty to a charge of using a handgun in a crime of violence.

Judge John M. Glynn sentenced the boy to 20 years, then suspended all but 12 years. He recommended that Cloude be sent to the youth offender program at Patuxent Institution.

Prosecutors said Cloude, of the 2000 block of Robb St., fatally shot 17-year-old Corey Mason on May 16 during a botched robbery attempt after leaving home detention.

In December, Cloude had been committed to the Charles H. Hickey Jr. School for juvenile offenders in Baltimore County after being charged with drug offenses. Despite a lack of progress there, counselors recommended that he be sent home under electronic monitoring.