Lawyers for Leslie Ross argued that fatal head injuries suffered by the women could have been due to alcohol-related falls rather than being subjected to violence.The theory was advanced as the 66-year-old pensioner was refused bail due to concerns about possible re-offending.Ross is alleged to have murdered former partners Michelle Bickerstaff and Margaret Weise five years apart in Dromore, Co Down.He is also accused of separate offences of indecent assault and gross indecency with a child.Charges were brought against him following an investigation into the circumstances surrounding 47-year-old Ms Bickerstaff's death in April 2012.She died in hospital after being discovered unconscious by her daughter in the house she shared with Ross, the court heard.Police then launched a probe into the circumstances surrounding the death of Ms Weise in August 2007.The 50-year-old, who was registered blind and suffered from alcohol dependency and depression, had been in an on-off relationship with the accused.Ross, of Meganlis Park in Dromore, claimed to have been wakened by the sound of a thump and found her lying at the bottom of stairs.According to his account, he put her back to bed, later calling a doctor when she failed to wake up.She later died without regaining consciousness.Opposing bail, prosecution lawyer David McClean claimed there was a risk of interference with witnesses in the case.Defence counsel Charles McKay QC claimed the case against his client was weak.He argued that pathologist reports into the deaths could not show Ross was responsible for the injuries.Dealing with Ms Weise, he described her as an alcoholic who had fallen many times.The pathologist could not say whether her head injuries were caused by such a fall or someone having struck her, Mr McKay stressed.Turning to Ms Bickerstaff, he set out how Ross claimed to have left her after buying her a bottle of whisky.When he returned to the house he discovered her daughter shaking and trying to revive her, the court heard.Setting out the level of drink Ms Bickerstaff was found to have consumed, the barrister said: "We are dealing with a colossal quantity of alcohol taken by the victim."Mr McKay again contended that it could not be determined if the fatal injuries were due to a blow to the head or from striking an object in a fall."You can see the picture emerging of uncertainty over what caused her death," he said."There is certainly no evidence he (Ross) struck her that day."Despite refusing bail, the judge warned the prosecution there was not an "endless timeframe" to progress the case.Mr Justice Weir added: "If there is disclosure in this case police should get on and make it so that the defence have the material available to them at the earliest opportunity."