POLICE HELI ORBITING OVER A CRIME SCENE HAS NMAC WITH TV NEWS HELI ARRIVING ON THE SCENE TO ORBIT.

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I WAS ASSIGNED TO THE ABOVE POLICE HELI AND RESPONDING TO A CRIME SCENE TO ASSIST OFFICERS WITH A HOMICIDE PERIMETER. I WAS COMMUNICATING ON FREQ 123.025 WITH OTHER HELIS AT THE SCENE; AND AT A HIGHER ALT THAN MYSELF. I WAS ESTABLISHED IN A L ORBIT; APPROX 20 DEGS OF BANK; AT 60 KTS; AND AT AN ALT OF 2200 FT MSL. AT THE SE CORNER OF THE PERIMETER ORBIT; IN A BANK; MY PARTNER (THE OBSERVER) SUDDENLY YELLED AT ME; 'WATCH OUT!' HE WAS POINTING TO MY 2 O'CLOCK POS AND SLIGHTLY LOW. I IMMEDIATELY LOOKED IN THAT DIRECTION; AND OBSERVED AN AS350; AT MY 2 O'CLOCK POS; APPROX 250 FT LATERALLY; AND APPROX 100 FT LOW; PASSING THAT POS TO MY FRONT. AT A HIGHER SPD THAN MY OWN; IT PASSED US AND IMMEDIATELY BEGAN AN ORBIT IN FRONT OF US AND SLIGHTLY OUTSIDE OF OUR ORBIT. I HAD MONITORED NO RADIO XMISSIONS FROM HIM TO INDICATE HIS INTENDED ACTIONS; NOR DID I RECEIVE ANY XMISSIONS BY HIM AT THIS TIME TO INDICATE THAT HE HAD OBSERVED ME. I IDENTED MYSELF; AND TOLD HIM TO TAKE VERT AND LATERAL SEPARATION. I IDENTED HIS ACFT AS A TV NEWS HELI.