Hi guys
Found Timothy's death certificate.
Looking at the locations of the baptisms and the fact that they resided in County Laois from 1837 to 1867, I narrowed my search down to the possible death records for Timothy Fitzpatrick in Laois. There were several possibilities, basing it on the fact he would not have been born before 1810 and no later than 1820.
He died in 1890 aged 80 at Derrylusk in Mountmellick, which is one of the baptism locations for one of his children. The informant is Timothy Fitzpatrick, whom I think is recorded as his son. He is given the occupation of farmer and died of bronchitis. He is a widower by 1890, meaning Catherine must have died between 1850 and 1890