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The man ran away after the female resident yelled at him, said Lt. Pat Welch of Tustin Police.
The suspect, who was wearing a blue T-shirt and red shorts, is described as a male Latino, in his mid-to-late 30s with curly hair and a mustache.
Tustin police are investigating six break-ins by prowlers that began Aug. 28 at the Creekside Meadows apartment complex at 13802 Tustin East Drive.
Though witnesses have provided varying descriptions, investigators suspect it is the same person because the method of operation in each case carries many similarities.
Because the prowler has been getting in through open doors and windows, police are asking the public to lock their doors and windows and call police immediately if they see or hear anything.
If you have information on the suspect, you're asked to call Tustin Police at (714) 573-3200 or (714) 573-3246.
CNS contributed to this report.