JACKSONVILLE, Fla. (AP) _ A man pleaded guilty to killing a woman by dousing her with gasoline and setting her afire in what the prosecutor called ''a spontaneous act of barbarism.''

Mahyar Ebrahimi-Zadeh, 24, pleaded guilty Wednesday to second-degree murder and first-degree arson in the death of Beverly Christine Taylor.

Witnesses said the two, who had known each other for about a year, argued at a gas station before she went inside to pay for gasoline. When Taylor returned, Ebrahimi-Zadeh sprayed her with fuel, then chased her with a lighter until he set her ablaze.

No motive was determined for the killing, said Assistant State Attorney Stephen Bledsoe. ''It was a spontaneous act of barbarism.''

Under a plea agreement, Ebrahimi-Zadeh, an Iranian national, will be sentenced to 40 years in prison for murder and another 10 for arson. In exchange, prosecutors agreed not to seek first-degree murder charges, which carry a possible death penalty.

Ebrahimi-Zadeh will face possible deportation when he is released from prison, which won't be for 25 to 30 years, said Assistant State Attorney Angela Corey Lee.