NMAC. POLICE DEPT HELI AND PIPER CHEROKEE. HELI TOOK EVASIVE ACTION AND APPARENTLY THE PIPER NEVER SAW RPTR. HELI FOLLOWED THE ACFT AND GOT ITS IDENT FROM SMO ARPT POLICE.

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ON ABOVE TIME AND DATE I WAS EMPLOYED BY THE LOS ANGELES POLICE DEPT AS A COMMAND PLT ASSIGNED TO HELI. I WAS FLYING AN AS350 B1. I WAS FLYING IN AN EASTERLY DIRECTION (APPROX 090 DEG HDG) BTWN 1100 FT AND 1200 FT MSL INDICATED. APPROX 800 FT AGL AND BELOW THE ELEVATIONS OF THE SURROUNDING HIGH RISE BUILDINGS. I HAD DEPARTED HOOPER HELIPORT 10 MINS EARLIER AND SET MY ALTIMETER TO THE FIELD ELEVATION PRIOR TO MY DEP. I WAS ALERTED BY THE SIGHT OF A PIPER CHEROKEE LESS THAN 50 FT ABOVE MY ALT AND TO THE L FRONT OF MY ACFT. THE CHEROKEE WAS FLYING ON AN APPROX HEADING OF 060 DEGS AND JUST PASSED DIRECTLY OVER MY ACFT BY LESS THAN 50 FT. THE CHEROKEE STARTED A L TURN AND CONTINUED NWBOUND ALONG THE HOLLYWOOD FREEWAY. THE CHEROKEE THEN TURNED TOWARD SMO ARPT AND BEGAN A CLB. I ATTEMPTED TO ESTABLISH RADIO CONTACT WITH THE CHEROKEE ON 123.025 MHZ BUT WAS UNABLE. I TUNED IN SMO TWR FREQ AND HEARD THE CHEROKEE RPT IN FOR LNDG WHEN HE WAS 5 MI E OF SMO ARPT. I AGAIN HEARD THE CHEROKEE RPT TO SMO TWR WHEN HE WAS OVER THE TWIN HIGH RISE. I VERIFIED BOTH OF THESE VISUALLY WITH THE RADIO RPTS. I THEN CALLED SMO GND CTL AND ASKED THEM IF THEY WOULD OBTAIN THE NAME AND IDENT OF THE PLT OF THE CHEROKEE. I HEARD SMO GND CTL DISPATCH THE SANTA MONICA ARPT POLICE FOR THE IDENT. I WAS UNABLE TO PERSONALLY LAND AND IDENT THE PLT OF THE CHEROKEE DUE TO A NUMBER OF URGENT POLICE CALLS FOR OUR SVC.