SALEM, Ore -- A Marion County jury sentenced a 45-year-old member of the Krude Rude Brood gang to death for fatally stabbing a fellow inmate while incarcerated in 2013.

It took the jury less than an hour to reach their verdict after hearing the prosecution's and defense's closing arguments on Thursday

The victim's family silently teared up as Judge Tracy Prall read the sentence aloud for David Ray Bartol.

In October, Bartol was convicted of aggravated murder for stabbing Gavin Siscel, 33, to death with a homemade knife in the Marion County jail's day room. Siscel was serving a 30-day sentence for contempt of court at the time of the attack.

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Bartol had been incarcerated since March 2013 while awaiting trial for a robbery. The day before he stabbed Siscel, Bartol was arraigned on attempted murder charges in connection with a January home invasion shooting in South Salem.

During closing arguments, Marion County Deputy District Attorney Matthew Kemmy argued that Bartol deliberately and intentionally murdered Siscel.

Kemmy said the attack was random and unprovoked. He was mad at his former co-conspirator for talking to investigators, Kemmy said, but the man was in protective custody, so Bartol lashed out at a random inmate. Siscel was in jail for contempt and had struggled with mental illness since he was young.

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Bartol braided threads from his uniform together and used it to saw through a plastic tote bin and form a shank. He sharpened the shank by rubbing it against concrete and dipping it into his toilet bowl. Kemmy said he slept with it hidden in his mattress.