EL GRANADA (CBS SF) — A Peninsula man was arrested for allegedly sexually assaulting an 11-year-old child he was babysitting, authorities said Wednesday.

The San Mateo County Sheriff’s Office said detectives began investigating the case on August 2 which involved the child being assaulted on three separate occasions by a family friend.

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Michael Banister (San Mateo County Sheriff’s Office)

The suspect was identified as 35-year-old Michael Banister of El Granada. The sheriff’s office said the assaults took place near his home while he was babysitting the child.

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On Tuesday, a $500,000 warrant was issued for Banister’s arrest and he was taken into custody. Banister was charged with three counts of lewd acts with a child under 14 years old as well as possession of a controlled substance.

The sheriff’s office said Banister has a lengthy criminal history in Oregon and had moved to the coastal community of El Granada within the past two years.

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Anyone with information about the suspect was asked to contact Detective J. Fava at 650-363-4192 or email jfava@smcgov.org.