What are the consequences of a conviction for aiding and abetting the killing of a man who was shot and killed by another man?

"Following a court trial, defendant was convicted of second degree murder ( 187, subd. (a)), for aiding and abetting in the killing of Galeana. As to defendant, the trial court found true the allegations under sections 186.22 and 12022.53, subdivision (d). Defendant's 15-year-to-life sentence was increased by 25 years to life pursuant to the section 12022.53 enhancement. Morales, the alleged shooter, was acquitted of all charges. The evidence against defendant showed that he was not the shooter." (People v. Garcia, supra, 28 Cal.4th at p. 1170, first italics added.)