Vincent Tabak researched the unsolved murders of Melanie Hall and Anni Dewani after strangling Joanna Yeates, a court heard today.
The 33-year-old defendant also looked up satellite imagery of the site where he dumped Miss Yeates's body.
He researched the Wikipedia page for murder and the maximum sentence for manslaughter, web records from work and personal laptops showed.
Lyndsey Farmery, an internet use analyst who assisted police with the investigation, took the jury through Tabak's internet use after killing 25-year-old Miss Yeates.
While regularly checking the Avon and Somerset police website and local news site http://www.thisisbristol.co.uk, the Dutch engineer was also checking decomposition rates.
Days after killing Miss Yeates at her Clifton flat on December 17, Tabak was watching a timelapse video of a body decomposing, Bristol Crown Court heard.
In Google searches, Tabak - who denies murder but admits manslaughter - looked up pages about the Tesco Finest pizza Miss Yeates bought on the night she died and also checked local council rubbish collections.
He was also said to have looked at an online article entitled: "Did killer take sock as a trophy?"
Ms Farmery only spoke to confirm the images displayed as the jury was shown dozens of internet pages said to have been viewed by Tabak.
At 10.30pm on December 19 - as Greg Reardon was becoming increasingly concerned for the welfare of his girlfriend and before police even knew Miss Yeates was missing - Tabak looked at Google maps of Longwood Lane, Failand, the location where he had earlier dumped her body on a snow-covered verge.
Prosecution barrister Nigel Lickley QC said Tabak researched average sentence rates for both murder and manslaughter before looking up the Wikipedia definitions for both.
On January 11 he was said to have Googled "definition sexual conduct" and then "definition of sexual assault".
He also clicked onto a website titled "Sexual offences explained".
Other internet searches included articles about the extradition of people from the Netherlands and the "short-term affects of alcohol".
In the days before his arrest on January 20, Tabak was checking a story about CCTV footage and regularly looked at online news sites, including the BBC, Metro, Daily Mail, Daily Telegraph, Daily Mirror and The Sun.
Mr Lickley described Tabak's online activity as "hourly, perhaps constant viewing".