7:04 a.m. update:
JSO announced that Barbara was located safely by a citizen.
Silcox is 5 feet 6 inches tall and weighs approximately 155 pounds, has gray hair and brown eyes, and was last seen wearing a black jacket and blue jeans.
ORIGINAL STORY:
The Jacksonville Sheriff's Office announced it is searching for Barbara Silcox, 69, who left for a doctor's appointment and has not yet returned.
JSO says that Silcox uses an oxygen tank and drives a 1995 green two-door Ford pickup with a Florida tag 145XKK.
Silcox left the Lackawana neighborhood and was supposed to be heading to her doctor appointment int he Rampart/Collins Road area, according to JSO.
If you see or know of Silcox's whereabouts contact JSO at 904-630-0500 or email them at JSOCrimeTips@jaxsheriff.org.
This is a developing story. Refresh this page, follow @ActionNewsJax on Twitter and watch Action News Jax for the latest.