A federal grand jury convicted Barry Bonds of a single charge of obstruction of justice Wednesday, but failed to reach a verdict on the three counts of allegations that he knowingly used steroids and human growth hormones and lied to a grand jury about it

Following the 12-day trial and almost four full days of deliberation, the jury of eight women and four men could reach a unanimous verdict only on one of the four counts against Bonds. U.S. District Judge Susan Illston declared a mistrial on the others.

Bonds legal team immediately asked that the guilty verdict be thrown out but Illston did not rule on the request, instead she set May 20th hearing for the case.

The maximum sentence for the obstruction of justice count is 10 years in prison, but federal guidelines called for 15-21 months. For similar offenses in the BALCO case, Illston sentenced cyclist Tammy Thomas to six months of home confinement and track coach Trevor Graham to one year of home confinement.