Detectives in Lancashire are still hoping to question a 21-year-old also arrested in connection with the incident.
According to detectives, the relationship between the mother, son and his girlfriend became strained.
If he dies it becomes a murder investigation and detectives would need to be quickly mobilised.
Five detectives were sent to Ecuador to learn more about the victim and his family.
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The detectives reported details from more than 200 conversations, or about one a week.
Derby Coroner's Court heard Dr Hunter say "human decency" should persuade people to talk to detectives.
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Detectives have been reviewing CCTV footage of the area in an attempt to trace her movements.
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Detectives do not believe there are any immediate concerns for the safety of the wider community.
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Mr. Landron, 23, asked for an attorney when he was interviewed by detectives, police said.
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Detectives said they were hoping to create a DNA profile of whoever killed the teenagers.
Detectives said he was heading to Copdock where Miss Nicol's body was later found.
On Tuesday afternoon, detectives went to that corner and took Mr. Davis into custody.
Scenes-of-crime officers, detectives and fire service investigators started examining the scene on Saturday, she said.
Detectives watched approximately 700 hours of CCTV from 150 cameras as part of their investigation.
"Detectives now believe that Arndt shot Miller and then shot himself, " police said in a statement.
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We all know how brilliant murder detectives can be, how skilled the forensic teams.
Detectives have travelled to Cyprus and the Republic of Ireland in the hope of tracing her.
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Detectives are reviewing CCTV tapes from cameras in the Time Centre, in Front Street.
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Detectives revealed that the semi-automatic pistol was a Schmeisser, of which about 40, 000 were originally manufactured.
It was an era when homicide detectives juggled a dozen or more investigations at once.
The Maserati's passenger and other witnesses are helping detectives piece together what happened, he said.
She was described by detectives as "a pretty lonely, insecure wee girl on that journey".
Detectives believe she was struck by light coloured Volvo XC90 registered between 2003 and 2007.
The detectives found two deaths that were not accounted for in the published study.
Christopher Halliwell led police to her grave but was not prosecuted after detectives ignored arrest guidelines.
"She went where police were conducting searches and she was shouting at the detectives, " Charamba said.
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The funding will pay for five extra specialist detectives and additional training for other police officers.
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But detectives said it left the woman so traumatised that she only came forward last week.
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