From Jan 9, 1997 edition of the Boulder Planet:
The sheriff recalled his unsuccessful investigation into the 1983 murder of 7-year old Tracy Neef, kidnapped from a Thornton school yard and found dead near Nederland's Barker Reservoir. she also had been sexually assaulted, and despite an extensive investigation, her killer was never found.

And from:http://p076.ezboard.com/fmissing87975frm64.showMessage?topicID=25.topic
Tracy Neef: How did 7-year-old Tracy Marie Neef vanish from her elementary school and end up dead a quarter-mile west of Barker Dam near Nederland? It's a homicide that has puzzled investigators since the morning of March 16, 1984.
That's when Tracy's mother dropped her first-grader off at Bertha Heid Elementary School in Thornton. But school officials reported that Tracy never attended school that day. Her body was found around 5 p.m. about 30 feet from a road off Boulder County 119.

Marilee Burt

Burt was walking home from a friend's house when she was murdered on Feb. 27, 1970. The 15-year-old was found strangled under a bridge on Deer Creek Canyon Road, southwest of Littleton. An autopsy report showed that she had been sexually assaulted and struck on the head by a blunt instrument.
Marilee, a member of the prominent Burt automobile family, had attended a middle school basketball game with her best friend when she decided to walk home from her friend's house. The best clue investigators uncovered was 10 feet of rope that apparently was used to strangle her.

Authorities thought they had a break in the case in 1981, when they briefly detained a man with a history of sexual assaults on girls. Ronald Bloom gave police a sample of his hair on May 31, 1981, so police could compare it with hair found in the rope at the crime scene.

Notice that is the same bridge where Alie Bereltz was found.

Alie Berrelez

Berrelez was playing with her baby brother in front of her family's Englewood apartment complex when she was kidnapped May 18, 1993. For four days, police combed the metro area before Yogi, a common-looking bloodhound, led police to the girl's body near the mouth of Deer Creek Canyon.
Alie's body was concealed in a duffel bag and dumped into a ravine. Police questioned Nicholas R. Stofer as a possible suspect, but Stofer eventually was cleared from suspicion.

Out of her death came the Alie Foundation, an advocacy group that buys bloodhounds for police departments.

To the extent that the statistics indicate a resident of the immediate neighborhood, perhaps some fairly nearby cases are indeed relevant. And if you expand 'resident of the neighborhood' both geographically and temporally, you get far more suspects. You even get the McReynolds who used to live three miles away years before the crime.

Standard police work would be to check the known perverts and then check the suspected perverts who had come to the attention of police in other cases but against whom a case had never been sufficiently established. Ofcourse, the BPD and the phrase 'standard police work' does seem strangely incompatible.

Maybe her murder was related to St. Patricks Day?

Saint Patrick's Day
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Saint Patrick's Day

The Chicago River, dyed green for the 2005 St. Patrick's Day celebration.
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Observed by Irish people
Irish citizens
Roman Catholics
Many others take part in some practices
Type National, Ethnic, Christian
Significance Catholic feast day which celebrates Saint Patrick, the patron saint of Ireland
Date March 17
Celebrations Parades
Wearing of green
Drinking of alcohol

St. Patrick's Day 2004 in Cork, Ireland.Saint Patrick's Day (Irish: Lá 'le Pádraig or Lá Fhéile Pádraig), colloquially Paddy's Day, is the feast day which annually celebrates Saint Patrick (386-493), the patron saint of Ireland, on March 17. It is a national holiday in the Republic of Ireland (a bank holiday in Northern Ireland); the overseas territory of Montserrat; and the Canadian province of Newfoundland and Labrador.

Saint Patrick's Day is celebrated worldwide by Irish people and increasingly by many of non-Irish descent. Celebrations are generally themed around all things green and Irish; both Christians and non-Christians celebrate the secular version of the holiday by wearing green, eating Irish food and imbibing Irish drink, and attending parades. The St. Patrick's Day parade in Dublin, Ireland is part of a five day festival, with over 500,000 people attending the 2006 parade. The largest St. Patrick's Day parade is held in New York City and it is watched by 2 million spectators. The St. Patrick's day parade was first held in New York City on March 17, 1756 when the Irish soldiers marched through the city. Parades also take place in other Irish towns and villages. Other large parades include those in Belfast, Manchester, Birmingham, London, Coatbridge, Montreal, Boston, Chicago, Kansas City, Savannah, Denver, Sacramento, and Scranton and Toronto. Large parades also take place in other places throughout Europe and the Americas, as well as Australia and Asia.