Jurors are expected to begin deliberations Tuesday in the case of Santa Rosa gang member Christopher "Spider" Mancinas, who is charged with the mistaken identity killing of a Vallejo musician.

Closing arguments from both sides stretched into the late afternoon Monday.

Prosecutors said Mancinas, 31, led a group to a Vallejo apartment complex to carry out an attack on rivals. They allegedly killed bass player Dewey Tucker, 24, on Interstate 80 after following his car out of the parking lot, prosecutors said.

Mancinas's lawyer, Jeff Mitchell, argued his client was trying to broker peace between warring factions of a Santa Rosa gang. Younger members chased down Tucker in a stolen car and carried out the actual shooting, Mitchell said.

Mancinas is charged with murder, conspiracy, shooting into an occupied vehicle and gang participation. In his closing argument, prosecutor Bob Waner asked jurors to consider second-degree murder as a starting point in their deliberation.

Waner said jurors must decide whether Mancinas's account of events is credible.

"You're talking about a guy who said, &‘I'm a sureno. I'm proud of that fact. And I'm going to tattoo the word sureno on my face,'" Waner said.

Groundwater: What you need to know

For information on the Sonoma County’s Sustainable Groundwater Management program, click here.

For a Department of Water Resources tool that will show if your property is in a groundwater basin, click here.

Groundwater basins are California’s largest reservoirs, more than 10 times the size of all surface reservoirs combined.

Groundwater provides about 38 percent of the state’s total annual water supply, and up to 60 percent in dry years.

Sonoma County draws more than 70 percent of its water from wells to meet demand for 260 million gallons a day.

More than 80 percent of Californians rely, in part, on groundwater for their drinking water.

Groundwater and surface water are interconnected, and groundwater pumping draws water from rivers and streams.