[Highland Park] missing a turtle???

a couple of days ago a turtle showed up in my pond at 1105 heberton st. from pics i looked up he appears to be a red-eared slider, which i found out are usually pets and not native to here, so i wondered if someone had lost him/her. seems to be content with the environment here but will likely need more cozy place for the winter......i'm curious to know if anyone knows anything about this guy...rich allen