SAN RAFAEL — Prosecutors say they won't be filing charges against a 67-year-old Northern California man who was arrested in September on suspicion of attempting to kill his girlfriend by giving her water containing chlorine.

Robert Lochridge was arrested after the San Rafael nursing home where his 63-year-old girlfriend was staying reported he was bringing her water with a pungent odor. Police said tests showed the liquid had a high concentration of chlorine.

Lochridge said he bought the bottled water online, where it was advertised as an alternative health product.

At the time, Chief Deputy Public Defender Debra Leyva described the case as a misunderstanding.

The Marin Independent Journal reports ( ) that in announcing Monday that charges would not be filed, Marin County prosecutors said Lochridge's girlfriend appeared to have suffered no ill effects from the water.

Information from: Marin Independent Journal,